just got a new atx case from aspire with back-lite blue glow and thermometer.  after installation all audio was lost.  id hear a suddle ring when sound should be coming out but thats it.  i  install everything back in the origional case and audio returns.  the case did not come with a power supply but can be sold with a 420 power upply.  i have a 280.  could an insufficient power supply explaine this loss of audio?
thanks!!
			
			thanks!!
				
		
			